Pattern plates with provision for shift correction



S. KLUTH Feb. 18, 1969 Sheet Filed June 17, 1966 INVENTOR SAM UEL KLUTH 4 3 m a w h 4 5 5 33 a 3 Z .fl 5- #1 3 3 3 5 n ATTORNEYS Feb 18, 1969 s. KLUTH 3,428,113

PATTERN PLATES WITH PRQVISION FOR SHIFT CORRECTION Filed June 17, 1966 Sheet 2 of 2 INVENTOR SAMUEL KLUTH ATTORNEYS United States Patent 3,428,113 PATTERN PLATES WITH PROVISION FOR SHIFT CORRECTION Samuel Kluth, N.85 W.160 75 Donald Court, Menomonee Falls, Wis. 53051 Filed June 17, 1966, Ser. No. 558,385 US. Cl. 164241 Int. Cl. 1322c 7/04, 21/08; F16b 7/04 7 Claims ABSTRACT OF THE DISCLOSURE This invention relates to improvements in pattern plates with provision for shift correction.

In foundry practice it is conventional procedure to form a pattern recess in the cope and drag flasks or molds by packing foundry sand around the pattern. In the use of pattern boards or plates it is a common problem after a period of use that due to wear or other factors a mismatch occurs between the two halves of the mold. This results in the pattern recess of one of the mold halves being shifted slightly with respect to the other recess so that there is an unacceptable jog produced on the exterior of the finished casting. This shift or mismatch may occur in two different directions at right angles to each other or any combination thereof.

Most pattern plates or boards are provided with end projections, with the projections of one of the pattern boards having pin fittings secured thereto to receive bushings of one mold flask half, and the projections of the other having bushing fittings to receive the pins of the other mold half flask for the purpose of aligning the pattern recesses formed in the flask. At the present time these pin and bushing fittings are usually square or rectangular plates and are sometimes inserted in open-ended slots in the pattern plate projections. These prior plates are not capable of being standardized at reasonable cost, and are difficult and expensive to make, install and maintain. In the case of wooden pattern plates the pin and bushing fittings are secured in position with lag screws or flat-headed wood screws. Wear on these screws in the holes eventually results in a mismatch requiring correction. Where metal pattern plates are employed the pin and bushing plates are usually secured by short screws which are tapped into the metal in locations which must be very carefully laid out relative to the horizontal and vertical lines of the pattern plate. With either wood or metal pattern plates there is the problem of wear on the removable pins or bushings, which is now taken care of by removing the old pins and bushings and driving new ones into the pin or bushing fittings. This removal and insertion will eventually result in wear on the holes in the pin or bushings plates. When, after a period of use, a mismatch occurs with either wood or metal pattern plates it has heretofore been necessary to send the plates back to the patternmaker who would have to replace the pins or bushings in the pin or bushing fittings and sometimes redrill screw holes in the pattern boards in order to get new locations. In any event, the correcting of a mismatch was a major operation usually delaying production for a period of about twenty-four hours.

It is a general object of the present invention to provide improvements in pattern plates wherein the pin and bushing fittings are of standardized size and circular shape, and so designed that a shift correction may be accomplished on the floor of the foundry in a relatively few minutes time.

A further object of the invention is to provide improvements as above described wherein the shift may be readily corrected in two directions at right angles to each other.

A more specific object of the invention is to provide improvements in pattern boards wherein there are a plurality of screw holes in each end projection which are equally spaced circumferentially around a clearance hole in the pattern board projection, and in which there are a plurality of interchangeable pin and bushing fittings each having an alignment hole for receiving a pin or bushing, and each having the same number of connection holes as the end projection of the pattern board arrranged in the same circular arrangement, some of the interchangeable pin and bushing fittings being correction fittings and having alignment holes which are slightly eccentric, in varying amounts from one another, so that one of the correction fittings may be selected and installed in a selected manner with respect to its bolt holes to vary the position of its eccentric alignment hole with respect to the alignment hole of the pattern plate in any amount and .direction which will correct the shift which has occurred.

A more specific object of the invention is to provide an improved pattern plate as above described wherein the pin and bushing fittings are preferably round disks to fit round recesses in the end projections of the pattern board, each round correction disk being rotatable in one direction or another in its recess to vary the position of the eccentric alignment hole in a selected manner for the correction which is being made.

With the above and other objects in view, the invention consists of the improved pattern plate with provision for for shift correction, and all of its parts and combinations. as set forth in the claims, and all equivalents thereof.

In the accompanying drawings, illustrating one complete embodiment of the preferred form of the invention, in which the same reference numerals designate the same parts in all of the views:

FIG. 1 is a plan view of a cope pattern and plate, looking into the pattern body, showing pin fitting disks having concentric alignment holes in position in the end projections;

FIG. 2 is a similar view of the drag pattern plate, showing, however, how the position of the pattern body has become shifted after use, in two directions with respect to the center lines;

FIG. 3 is a view similar to FIG. 1, showing the relationship of the pattern body to the original horizontal center line after correction fittings have been installed in a predetermined manner to replace the original pin inserts and correct a vertical shift a predetermined amount, such as &2";

FIG. 4 is a view similar to FIG. 2, showing correction fittings installed in the end projections in such a manner as to provide a predetermined correction, such as a correction, in horizontal direction with respect to the longitudinal center line of the pattern plate;

FIG. 5 is a plan view of one of the improved pin and bushing disks with its hole concentric for original installation;

FIG. 6 is a similar view, showing a correction fitting having its alignment hole & eccentric with respect to the circle of the bolt holes;

FIG. 7 is a similar view, showing a correction fitting having its alignment hole eccentric with respect to the circle of the bolt holes;

FIG. 8 is a similar view, showing a correction fitting having its alignment hole eccentric with respect to the circle of the bolt holes;

FIG. 9 is a similar view, showing a correction fitting having its alignment hole A eccentric with respect to the circle of the bolt holes;

FIG. 10 is a fragmentary sectional view through an end projection of a wooden pattern board showing a typical fitting disk installation with a pin removably installed; and

FIG. 11 is a similar view of a metal pattern board showing a typical fitting disk installation with a bushing removably installed.

Referring more particularly to the drawing, the numeral (FIG. 1) designates a pattern boa-rd having a cope pattern body 21 thereon. This body is used to form a recess in sand in the cope mold half in the usual manner. The pattern board has end projections 22 which have circular fitting recesses 23 therein. Referring to FIG. 11, each end projection has a relief hole 24' centrally of its recess 23 for receiving a pin or bushing part, such as the body 25 of a pin 26, as shown in FIG. 10, or the outside diameter of bushing 26', as shown in FIG. 11. It is an important feature of the present invention that the diameter of the hole 24 of FIG. 10 or 24 of FIG. 11 of the pattern plate projections be at least /8 to larger than the diameter of the pin head 25 or bushing end 26' to allow for correction, as will be hereinafter explained. Arranged in a circle around the center of each hole 24 or 24 is a series of screw holes 27 which are equally spaced circumferentially from one another. It is preferred to use four screw holes 90 apart from each other, as shown in FIG. 1, either 45 from the horizontal or vertical center lines of the pattern plates as shown, or they can be on said center lines.

The pattern board 28 of FIG. 2 has a drag pattern body 29 to match the cope pattern, and the board 28 has end projections 30 which are provided with circular recesses 31, one of the projections 30 having a central alignment hole, such as the hOle 24' shown in FIG. 11, and the other projection having a central alignment opening to suit the slot 34:: of the one fitting disk which has such slot (see FIG. 2) (it being customary to have one slot end on the drag).

Screw or bolt holes 27 are arranged in a circle around the center of each hole 24 of the drag pattern (see FIG. 11) in the same arrangement as the screw holes 27 of the cope pattern board. Where there are four screw holes 90 apart on the cope pattern board, four screw holes 90 apart from each other on each of the projections of the drag pattern board are also used. Both sets of four holes are located 45 from the vertical and horizontal center lines of the pattern plates, as shown, or on said center lines.

As a novel feature of the present invention there is provided for interchangeable use in the recesses 23 of the cope pattern board or in the recesses 31 of the drag pattern board, pin or bushing fittings 33. In the preferred embodiment of the invention the recesses 23 of the cope pattern board and 31 of the drag pattern board are circular to interchangeably receive circular fittings 33, as shown in FIGS. 5-9, inclusive. The fitting 33 of FIG. 5 has a central alignment hole 34 for removably receiving either a pin 26, as in FIG. 10, or a bushing 26', as in FIG. 11. Arranged in a circle around the center of the hole 34 is a series of suitably counterbored screw or bolt holes 35 which are equally spaced circumferentially. In the preferred embodiment of the invention there are four of the holes 35 in each fitting. In any event, there must be the same number of holes 35 as there are holes 27 in the projections of the pattern plates. FIG. 5 illustrates a standard fitting with its hole 34 concentric with the circle of the bolt holes 35.

As distinguished from the fitting disk 33 which has the concentric hole 34 there is a series of correction fittings 33a, 33b, 33c, and 33d, as shown in FIGS. 6-9, inclusive, which provide a variety of correction possibilities. In the fitting of FIG. 6 the central hole 34a is eccentric with respect to the circle of the bolt holes 35; in the fitting of FIG. 7 the hole 34b is & eccentric with respect to the circle of the bolt holes 35; in the fitting of FIG. 8 the hole 340 is eccentric with respect to the circle of the bolt holes 35; and in the fitting of FIG. 9 the hole 34d is eccentric with respect to the circle of the bolt holes 35. The amount of eccentricity on the correction disks may vary, but those described above provide a good selection for correction purposes. In addition, there should be a supply of disks 33e (FIGS. 2 and 4) having slots 34:: instead of holes for use at one end of the drag as is customary.

When the disks 33 are used on a wood pattern board as shown in FIG. 10, a second disk 133 must be used on the underside, which is the same as the disk 33 except its holes 135 are tapped instead of plain. With this arrangement the operative fitting 33 is held in position by long, headed bolts 36', the heads of which are countersunk in the disk 33 and the inner ends of which are threaded into the tapped holes 135 of the bottom disk, as is clear from FIG. 10. It is to be understood that if the pin fittings of FIG. 10 are used on metal pattern boards they will be installed the same as the bushing fittings of FIG. 11.

Where the disks are used on metal pattern boards, as in FIG. 11, it is unnecessary to have a second disk on the underside. Instead, short bolts 36 are threaded into the tapped holes 27 in the metal as shown in FIG. 11. In all cases the alignment hole 24 or 24' is at least &4 to 75 larger than the diameter of the pin head 25 or bushing. When the bushing fittings of FIG. 11 are used on wood boards the installation is the same as the installation of the pin fitting of FIG. 10.

Shift correction The pattern boards are originally fitted with disks 33 of FIG. 5 having concentric holes 34. After a period of use a shift of relative position of the pattern recesses in the flask with respect to either or both of the longitudinal and transverse center lines of the pattern boards may occur for various reasons such as wear on the pins or bushings or for other reasons. FIG. 2 illustrates that a shift of about A to the right with respect to the longitudinal center line X, as indicated at a, and a shift of about with respect to the transverse center line, as indicated at b, has occurred. In order to correct such shift the bushing fittings 33 of the drag pattern plate are replaced with correction plates 33d of the type shown in FIG. 9 and with a plate 33:: having an eccentric slot 34a to provide a ,5 correction, as shown in FIG. 4. In installing these correction fittings they are rotated in their recesses 31 until the eccentric hole 34d and slot 34e are offset in the right direction from the center line. By having four bolt holes it is possible to rotate the correction disks in increments of to obtain the proper position. By having more equally spaced bolt holes a finer correction may be made but this is not usually necessary, four bolt holes usually sutficing. In FIG. 4 the alignment holes 34d and slot 34c of the disks are offset to the right to make the correction in the proper direction, as shown at c.

Where the shift occurs in two directions, such as at right angles to one another, the correction in the other direction is made in the other pattern plate. Referring to FIG. 3, the original fitting disks 33 have been replaced with correction disks 33b of FIG. 7 for a & correction, and they have been rotated before the bolts are inserted to attain a correction d in a downward direction from the transverse center line Y of the pattern board, as is clear (from FIG. 3. After these corrections have been made, then when the pins 25 which project from the fittings 33 of the cope pattern plate are inserted in the bushings of the cope flask ears, and when the bushings 26' of the fittings of the drag pattern plate receive the pins projecting from the ears of the drag flask section, then it is insured that the flask recesses will be perfectly aligned and that the shift in both directions will be corrected when the two flask sections are removed from the pattern plates and fitted to each other.

This type of correction may be made whenever required in less than one hour on the floor of the foundry. Heretofore it was necessary to send the pattern boards back to the patternmaker to correct a mismatch of this type. He would frequently replace pins or bushings and sometimes redrill holes in the pattern boards to get new locations. This was a very complicated procedure and usually halted production at least twenty-four hours. The rotation of a correction plate during installation with its eccentric pin head 25 or bushing projection 26' is permitted because the alignment holes 24 and 24 in the center of the pattern board recesses are made sufliciently larger than the pin heads or bushing ends so that the correction plate with the greatest eccentricity can still be rotated to any selected position.

By using circular end fittings it is easy to rotate the fittings in the circular recesses when making a correction. The circular shape also simplifies the laying out of the recesses in the pattern boards because they are circular and hence simplifies the manufacture of the plate itself. Also, regardless of the shift correction, the use of circular end fittings makes it possible to standardize cope and drag pin and bushing end plates, and to standardize the holes for the bolts or screws which secure the plates in position. With these standardized, the center hole 34 of a pin or bushing plate may be readily drilled to any desired size to accommodate the particular pin or bushing being used. In the industry, these pins and bushings vary considerably from one another in size.

It is apparent from the above that corrections are easily made without any problem of redrilling screw holes in the pattern boards and with no necessity of sending the pattern boards back to the patte-rnmaker for making new pin and bushing fittings to fit the particular situation which needs correction, or for relocation. The present invention makes it possible to use standard pins 26 and bushings 26 in the fittings.

Various changes and modifications may be made without departing from the spirit of the invention, and all of such changes are contemplated as may come within the scope of the claims.

What I claim is:

1. A shift correcting pattern plate having end projections, a plurality of connection member holes in each end projection arranged in equally spaced relationship in a circle, a pin or bushing fitting for each end projection, each of the latter having a hole for receiving a pin or bushing and having the same number of connection member holes as an end projection of the pattern board arranged with the same spacing and circular arrangement around the pin or bushing hole, the pin or bushing hole in each fitting being slightly eccentric with respect to the circle of its connection member holes, and removable connection members extending through selected connection member holes of the fittings and pattern plate projections connecting the fittings in a predetermined position of rotation with respect to the pattern plate projections to bring the eccentric holes in a predetermined position with respect to the pattern plate to correct a particular pattern shift.

2. A pattern plate as set forth in claim 1 in which each end projection has a recess of a shape to receive one of the pin or bushing fittings in a selected one of several possible positions of rotatable adjustment, and in which the circle of connection member holes is within the outline of the recess.

3. A pattern plate as set forth in claim 2 in which the recesses of the end projections are circular, and in which the fittings are circular and of a size to fit in the circular recesses. v

4. A pattern plate as set forth in claim 1 in which there are four connection member holes in each end projection and in each fitting.

5. A shift correcting pattern plate having end portions, a recess adjacent each end portion having a center, a plurality of pattern board connection member holes in each recess arranged in equally spaced relationship in a circle around said center, a pin or bushing fitting in the recess of each end portion, each fitting having a hole for receiving a pin or bushing and having at least one connection member hole positioned the same radial distance from said recess center as the radial distance of the pattern board connection member holes of a recess from said center, the center of the pin or bushing hole in each fitting being slightly eccentric with respect to its recess center, and at least one removable connection member extending through a hole in each fitting and a selected hole in a recess serving to connect the fittings in a predetermined position of rotation in the pattern plate recesses to bring the center of each eccentric hole of a fitting in a predetermined position with respect to a recess center to correct a particular pattern shift.

6. A shift correcting pattern plate having end portions, a recess adjacent each end portion having a center, a pin or bushing fitting in each recess, each fitting having a hole for receiving a pin or bushing the center of which is slightly eccentric with respect to its recess center, and means for removably connecting each fitting in its recess so that the center of its eccentric hole is in a selected one of a plurality of positions around said recess center to correct a particular pattern shift.

7. A shift correcting pattern plate as claimed in claim 6 in which there are four positions for the center of the eccentric hole of the fitting, which positions are ninety degrees from each other.

References Cited UNITED STATES PATENTS 1,599,379 9/1926 Freeman 164241 2,213,919 9/1940 Michon 287-136 2,210,208 10/1940 Michon 287136 3,030,677 4/1962 Kindt et al. 164385 3,302,255 2/1967 Wagner 164238 FOREIGN PATENTS 488,125 12/ 1929 Germany.

I. SPENCER OVERHOLSTER, Primary Examiner.

EUGENE MAR, Assistant Examiner.

US. Cl. X.R. 

